DE69920480T2 - WATER-IN-OIL MICRO-EMULSION FOR OBTAINING COSMETIC PROPERTIES IN COMPOSITIONS BASED ON WASHBAND MAKERS - Google Patents

Abstract

A perfume-containing water-in-oil microemulsion is provided which is capable of being mixed with an aqueous fabric softener base composition to provide perfume thereto. The use of the defined microemulsion enables the addition of perfume as well as other cosmetic attributes to an aqueous base composition under conditions of low shear while avoiding any problems of gelation or physical instability in the finished fabric softener product.

Description

Territory of invention

These The invention relates to a composition and a method for "subsequent Addition of "cosmetic attributes to a fabric softening base composition in the last section their production. In particular, it relates to a water-in-oil microemulsion, the one for that is suitable to contain aids such as perfume or colorants and easy with the fabric softening base composition in just one minimal amounts of shear without adverse effect their physical stability can be mixed.

background the invention

Perfumes and dyes are routinely used in fabric softening Introduced compositions, to provide appealing cosmetic attributes to the consumer. The introduction of perfume in for example, a liquid plasticizer composition means that they have a pleasant and lasting fragrance on the treated textiles leaves. The dye should provide a visually appealing product and the consumer convey an overall impression of the balance and quality. From the marketing standpoint here are perfumes and colorants Attributes that allow the formulator a degree of flexibility a product variety for a given softening technology or for a fixed softening fabric To provide basic composition.

Even though Perfume unchanging in terms of weight a very small component of a commercial fabric softening composition is his introduction into the composition in an efficient way subject of much attention in formulation technology. This is especially true for concentrated Fabric softening agents containing more than about 10% by weight of effective softening Ingredients contain, in so far as that the aqueous softener base compositions tend to gel in the presence of water immiscible perfume. This tendency to gelation becomes particularly problematic when the water-immiscible perfume bad in the aqueous Emulsion is dispersed, which is the plasticizing base composition represents.

undesirable Thicken or unwanted Gelling a plasticizer base composition has significant Disadvantage. It reduces the effective bearing life of the finished Product and adversely affected consumer acceptance of a plasticizer product when used thickened to an unexpectedly viscous mass, instead of it consumer expectations to the extent that it is essentially free flowing is. As a result, the prior art has overcome itself the associated problems of gelation and formation of highly viscous liquids to solve tried that with the introduction water-insoluble perfumes in watery Fabric softener base compositions are connected.

The US-A-5 447 644 to International Flavors & Fragrances (IFF) describes Method for avoiding gelation of the softening composition, the introduction increased Quantities of perfume resulting in a plasticizer base composition. According to this procedure becomes first an aqueous one Microemulsion formed by adding the perfume with a defined nonionic Surfactant is mixed under high shear conditions to the perfume in the Surfactant / water mixture uniform to disperse. This perfume containing microemulsion is then treated with a fabric softener base formulation mixed to form the final fabric softening composition. For this Mixing process requires a high shear mixer.

It Therefore, there is a need in the art for a lightweight process introduction of perfumes and dyes into a fabric softening base at the end of the manufacturing process or even by the consumer himself at home under very gentle Mixed conditions, the need for high shear mechanical Movement and equipment is avoided. Further, there is a need for a method that apart from the introduction of perfume and colorants in a basic formulation this meets without the rheological and physical stability of the finished product adversely affect.

Summary the invention

• (a) 5 bis 80 Gew.-% Tensidtextilweichmacher ausgewählt aus der Gruppe bestehend aus: (i) Diesterammoniumverbindungen mit den folgenden Strukturformeln:
  
  in der jedes A unabhängig C(O)O-R' oder -O(O)C-R' ist, R eine niedere Alkylgruppe mit 1 bis 4 Kohlenstoffatomen ist, R' eine Alkyl- oder Alkenylgruppe mit 8 bis 22 Kohlenstoffatomen ist, R'' unabhängig ein niederer Alkylrest mit 1 bis 6 Kohlenstoffatomen oder eine Hydroxyalkylgruppe oder H ist, n eine Zahl mit einem Wert von 2 ist und X^– ein mit dem Weichmacher verträgliches Anion ist, und
  
  in der B unabhängig A oder (R)A ist und A, R, R'' wie oben definiert sind, und
  
  in der A, R und R'' wie oben definiert sind, und/oder (ii) Diamidoammoniumverbindungen mit der Formel
  
  in der X^– und R' wie oben definiert sind, R¹ ein niederer Alkylrest mit 1 bis 4 Kohlenstoffatomen oder Wasserstoff ist und R ein Alkylenrest mit 2 bis 4 Kohlenstoffatomen ist,
• (b) 2 bis 50 Gew.-% organisches Lösungsmittel,
• (c) 5 bis 80 Gew.-% mit Wasser nicht mischbares Parfüm, wobei die Komponenten (a), (b) und (c) die Ölphase der Mikroemulsion umfassen,
• (d) 0 bis 1% Färbemittel und
• (e) 0,5 bis 25 Gew.-% Wasser, wobei die Mikroemulsion frei von anionischem Tensid ist und ein Gewichtsverhältnis der Ölphase zu Wasser von 3 : 1 bis 200 : 1 aufweist, wobei die Prozentsätze der Komponenten (a), (b) und (c) und der Wert des Gewichtsverhältnisses so gewählt sind, dass die resultierende Zusammensetzung eine Wasser-in-Öl-Mikroemulsion bildet.

According to the present invention, there is provided a perfume-containing water-in-oil microemulsion capable of being mixed with a perfume-free fabric softening base composition which is in the form of an aqueous emulsion so as to control perfume in the aqueous emulsion under conditions to disperse with low shear while avoiding any gelation problem thereby to provide a physically stable perfume-containing liquid fabric softening composition, the water-in-oil microemulsion comprising:

• (a) from 5% to 80% by weight of surfactant fabric softener selected from the group consisting of: (i) diester ammonium compounds having the following structural formulas:
  
  wherein each A is independently C (O) OR 'or -O (O) CR', R is a lower alkyl group of 1 to 4 carbon atoms, R 'is an alkyl or alkenyl group of 8 to 22 carbon atoms, R''is independently a lower alkyl radical having 1 to 6 carbon atoms or a hydroxyalkyl or H, n is a number having a value of 2, and X ^- is a softener compatible anion, and
  
  in which B is independently A or (R) A and A, R, R "are as defined above, and
  
  in which A, R and R "are as defined above, and / or (ii) diamidoammonium compounds having the formula
  
  are as defined above and R ', R ¹ is a lower alkyl radical having 1 to 4 carbon atoms or hydrogen and R is an alkylene radical having 2 to 4 carbon atoms, ^- X
• (b) 2 to 50% by weight of organic solvent,
• (c) 5 to 80% by weight of water immiscible perfume, wherein components (a), (b) and (c) comprise the oily phase of the microemulsion,
• (d) 0 to 1% of colorant and
• (e) 0.5 to 25% by weight of water, wherein the microemulsion is free of anionic surfactant and has a weight ratio of the oil phase to water of 3: 1 to 200: 1, the percentages of components (a), (b ) and (c) and the weight ratio are selected so that the resulting composition forms a water-in-oil microemulsion.

According to one preferred embodiment the diester ammonium compounds are (a) (i) quaternary diester ammonium compounds.

Danielsson and Lindman "The defintion of microemulsion ", Colloids and Surfaces, 3 (1981), 391-392, Elsevier Scientific Publishing Company, have a "microemulsion" as a system of water, oil and amphiphile that defines a single optically isotropic and thermodynamic stable liquid solution is'. This definition of microemulsion is used herein in the description of the present invention Invention used.

• i) klar
• ii) sie ist frei von einem lyotropen flüssigkristallinen System (d.h. sie ist isotrop)
• iii) sie weist eine relativ geringe Viskosität auf.
• iv) sie wird spontan durch einfache Mischung/Bewegung aller Komponenten gebildet (d.h. sie ist thermodynamisch stabil).

As defined above, a microemulsion has the following characteristics:

• i) clearly
• ii) it is free from a lyotropic liquid crystalline system (ie it is isotropic)
• iii) it has a relatively low viscosity.
• iv) it is formed spontaneously by simple mixing / agitation of all components (ie, it is thermodynamically stable).

More detailed Information regarding the various aspects of microemulsion systems such as definition, phase behavior, structure, low interfacial tensions and thermodynamic behavior is heterogeneous in the article by R. Zana "Microemulsions" Chemistry Reviews, Vol. 1, 1465-157 (1994), edited by John Wiley & Sons Ltd., disclosed.

• (a) eine parfümhaltige Wasser-in-Öl-Mikroemulsion, wie sie oben definiert ist, bereitgestellt wird, und
• (b) eine Menge der Wasser-in-Öl-Mikroemulsion, die ausreicht, um die gewünschte Menge Parfüm zu enthalten, mit der Textilweichmacherbasiszusammensetzung unter Bedingungen geringer Scherung gemischt wird, wodurch die Inversion der Mikroemulsion und der Dispersion des Parfüms in der wässrigen Emulsion unter Bildung einer physikalisch stabilen parfümhaltigen flüssigen textilweichmachenden Zusammensetzung bewirkt wird.

The present invention also provides a process for introducing a perfume into a perfume-free fabric softening base composition, which is in the form of an aqueous emulsion, under conditions of low shear and without adversely affecting its physical stability, in which

• (a) a perfume-containing water-in-oil microemulsion as defined above is provided, and
• (b) mixing an amount of the water-in-oil microemulsion sufficient to contain the desired amount of perfume with the fabric softening base composition under low shear conditions, thereby preventing inversion of the microemulsion and the dispersion of the perfume in the aqueous emulsion Formation of a physically stable perfume-containing liquid fabric softening composition is effected.

The water-in-oil microemulsion compositions according to the invention are predominantly from the oily Phase as defined above, namely the cationic surfactant textile softener, the organic solvent and the water-insoluble Perfume composed. To get a composition in the desired Phase of a water-in-oil microemulsion In general, the amount of water should be 5 to 25% by weight. be.

The preferred quaternary Diester ammonium surfactants for use herein are the dioleyl diester "quats" represented by Eq (1) are shown. Particularly preferred is methyl bis [ethyl (oleyl)] - 2-hydroxyethylammonium methylsulfate, that usually is called "DODEQ".

The The present invention is based on the finding that cosmetic attributes such as perfume and colorants easy to a watery fabric softening base composition in the last section of their Manufacturing "can be added later" by a water-in-oil microemulsion, as defined herein is used as the carrier to which the aqueous To add emulsion and to mix with it is the finished product to build. The water-in-oil micro emulsion is added to the softening base composition under conditions gentle movement or low shear introduced, with sufficient Quantity is used to the desired Level of perfume in the finished product. The microemulsion undergoes dilution in the aqueous Emulsion an inversion, which serves to perfume or dye efficient without associated problems of gelation or product instability in the to disperse throughout the composition.

Accordingly The present invention provides important advantages from the standpoint the preparation of a softening product composition as well as ensuring the integrity of the finished The product itself. The essence of the present invention is an oil-in-water emulsion, which is easy at room temperature without the need for high shear forces or extensive mixing equipment can be formed. And regarding the finished product is clear that the introduction cosmetic attributes in a softening base composition without adverse effect the rheology or physical stability of the resulting product is achieved.

Full Description of the invention

Diesterammoniumtensid quaternary fabric softeners, represented by equation (1), are preferred for use herein and are commercially available from Stepan Co. as Stepantex and from KAO Corp. ^® available as Tetranyl ^®, but of a fatty acid with a trialkanolamine, preferably, triethanolamine followed by methylation with dimethyl sulfate or an alkyl halide such as methyl iodide may also be synthesized by the reaction of 2 moles. In a preferred embodiment, the fatty acid is oleic acid. For economic reasons it has been found that soybean fatty acids consisting of about 3% myristic acid, about 5% palmitic acid, about 5% palmitoleic acid, 1.5% stearic acid, 72.5% oleic acid and About 13% linoleic acid is a practical source for this purpose. Other sources of useful fatty acids are those obtained by the saponification of beef tallow, butter, corn oil, cottonseed oil, lard, olive oil, palm oil, peanut oil, cod liver oil and coconut oil.

A preferred quaternary diester ammonium surfactant fabric softener is methyl bis [ethyl (oleyl)] - 2-hydroxyethyl ammonium methyl sulfate. Other diesters useful in the practice of the invention include:
Methyl bis- [ethyl (coconut)] - 2-hydroxyethyl;
Methyl bis- [ethyl (decyl)] - 2-hydroxyethyl;
Methyl bis- [ethyl (dodecyl)] - 2-hydroxyethyl;
Methyl bis- [ethyl (lauryl)] - 2-hydroxyethyl;
Methylbis- [ethyl (palmityl)] - 2-hydroxyethylammonium methylsulfate and
Methyl bis [ethyl (weichtalg)] - 2-hydroxyethyl.

The Term of the expressions Coconut and tallow are mixtures of esters, that of the fatty acid source correspond.

at the production of quaternary Diester ammonium surfactants may contain a certain amount of triester homologues be generated as an impurity.

Of the The term "perfume" is used herein in its ordinary Used to point to any water-insoluble perfume substance or mixture of substances to indicate and include, wherein this natural (i.e., obtained by extraction of flowers, grasses, flowers or plants), artificial (i.e. a mixture of natural oils or oil components) and synthetic (i.e., a single or a mixture of synthetic produced substances) include odorous substances. Typically they are perfumes complex mixtures or mixtures of different organic ones Compounds such as esters, ketones, hydrocarbons, lactones, Alcohols, aldehydes, ethers, aromatic compounds and varying Quantities of essential oils (e.g., terpenes), such as 0 to 80%, usually 10 to 70% by weight, the essential oils even fleeting smelling compounds are and also to the solution of the other components of the perfume serve. The exact composition of the perfume has no special effect on the fabric softening, as long as it meets the criteria of water immiscibility and the pleasant smell.

organic Solvent, suitable for use in this invention include: aliphatic alcohols having 1 to 6 carbon atoms such as Ethanol, propanol, isopropanol, n-butanol, isobutanol, tert-butanol, n-pentanol, isopentanol, sec-pentanol, n-hexanol, isohexanol and other isomers; aliphatic polyalcohols such as ethylene glycol, Propylene glycol, butylene glycol, diethylene glycol, dipropylene glycol, 1,4-butanediol, 2-methylpentanediol, hexanetriol, tripropylene glycol, Pentaerythritol, glycerin and sorbitol; aliphatic ethers such as Ethylene glycol monobutyl ether (EGMBE), diethylene glycol monobutyl ether (DEGMBE), diethylene glycol dimethyl ether, triethylene dimethyl ether, Ethylene glycol monomethyl ether, propylene glycol monoethyl ether, dipropylene glycol monomethyl ether, Dipropylene glycol propyl ether (DPnP), dipropylene glycol butyl ether (DPnB), Tripropylene glycol monomethyl ether and methoxymethyl butanol; aliphatic Esters such as methyl lactate, ethyl lactate, isopropyl lactate, Butyl lactate, dibasic esters of carboxylic acids, ethoxyethyl acetate, propylene glycol butyl ether acetate and butoxyethyl acetate.

To the preferred organic solvents for use herein Dipropylene glycol methyl ether (DPM), dipropylene glycol monobutyl ether (DPnB) and ethylene glycol monobutyl ether (EGMBE).

In the water-in-oil microemulsion compositions of the invention is the weight range of the cationic surfactant in general 5 to 80% and preferably 10 to 60% by weight is the weight range of the organic solvent generally 2 to 50% and more preferably 4 to 40% by weight, and is the weight range of the water-insoluble perfume in general 5 to 60%, and more preferably 10 to 70% by weight. The water content is generally 0.5 to 25% and preferably 5 to 25% by weight. The weight ratio of defined oily Phase to water is generally 3: 1 to 200: 1, preferably 5: 1 to 50: 1 and most preferably 5: 1 to 20: 1.

The microemulsions according to the invention have a particle size between 10 and 100 nm. For particle sizes below about 50 nm, the microemulsions generally become clear. The microemulsions are formed by simply combining the above-described components of the composition with gentle movements or low shear. A conventional mixing device containing the Is known to professionals, is sufficient for this purpose. All of the components described herein, both required and optional, must normally be liquid, namely liquid at ambient room temperatures. Accordingly, there is no need for heating during the preparation of the microemulsions.

The Invention is further described in the following examples. All Parts and percentages refer to the weight unless otherwise stated is.

Microemulsion compositions / area in one pseudo-ternary Phase diagram (i.e., 4 components) became basic on one clear / cloudy criteria basis determined by mixing three of the components and using incremental Quantities of the fourth component were titrated. Generally, 3.0 g of a mixture of organic solvent (or a mixture of it), water-immiscible perfume and water, in one suitable / fixed ratio introduced and then titrated with DODEQ (dioleyl diester quat). The samples were mixed at room temperature using a magnetic stirrer, which was operated at 100 to 150 rpm, whereupon they have a few Were left for minutes before the visual check regarding Clarity / turbidity was hired. Clear samples were further under a polarizing microscope examined to check whether the fluids were isotropic. Through this procedure became valued areas for microemulsion compositions on pseudo-ternary Phase diagrams isolated. Some compositions that are inside of these microemulsion surfaces were selected to illustrate the invention.

Description of chemicals and methods of preparation used in the following examples were.

CHEMICALS

in der R₁ und R₂ ungesättigte C₁₇H₃₄-Alkylketten aus Ölsäure sind.The water-in-oil microemulsions contain dioleyl diester quat (DODEQ) as described hereinbefore. The formula of DODEQ is as follows:

in which R ₁ and R _{2 are} unsaturated C ₁₇ H ₃₄ alkyl chains of oleic acid.

DODEQ is commercially available from KAO as Tetranyl ^® or from Stepan Co. as Stepantex® ^®. It is synthesized by the reaction of 2 moles of oleic acid with triethanolamine followed by methylation with dimethyl sulfate.

For economic purposes, oleic acid can be substituted by olive fatty acids in the synthesis of DODEQ, such olive fatty acids include 14% palmitic acid, 2% palmitoleic acid, 2% stearic acid, 64% oleic acid, 16% linoleic acid and 2% linolenic acid. Such a material is available from KAO under the name Tetranyl AO-2 ^®.

The water-soluble dyes used in the examples are marketed under the name Liquitint Royal Blue ^®, Liquitint Yellow LP ^® and Liquitint Nature Green ^® by Miiliken Chemical Company.

• (i) eine Dialkylamidoaminverbindung, die kommerziell als Rewopal V3340^® von Rewo erhältlich ist, und
• (ii) ein Dialkylesterquat, das als Tetranyl AT175^® von KAO verkauft wird.

The fabric softening base compositions contain two main softening compounds:

• (i) a Dialkylamidoaminverbindung that Rewopal V3340 ^® is commercially available as available from Rewo, and
• (ii) a Dialkylesterquat, which is sold as Tetranyl AT175 ^® by KAO.

in der n eine Zahl von 1 bis 3 ist, R ein Alkylenrest mit 2 bis 4 Kohlenstoffatomen ist, R' eine Alkyl- oder Alkenylgruppe mit 8 bis 22-Kohlenstoffatomen ist, R¹ eine niedere Alkylgruppe mit 1 bis 4 Kohlenstoffatomen oder Wasserstoff ist und X^– ein weichmacherverträgliches Anion ist.The dialkylamidoamine compounds have the following general structural formula:

wherein n is a number from 1 to 3, R is an alkylene radical having 2 to 4 carbon atoms, R 'is an alkyl or alkenyl group having 8 to 22 carbon atoms, R ^{1 is} a lower alkyl group having 1 to 4 carbon atoms or hydrogen, and X ^{- is} a softener compatible anion.

method for the preparation of softening base composition

The Plasticizing ingredients are each melted together with stirring mixed and at 60 to 70 ° C held. The mixture of molten, softening compounds becomes too heated (60 to 70 ° C) deionized water while stirring when using an impeller with four inclined leaves added. The hot one The water mixture is stirred for 10 to 15 minutes at about 400 rpm to to emulsify the molten ingredients. For concentrated compositions becomes the stirring speed increased to 700 to 800 rpm, because the viscosity the emulsion rises. If required in the recipe composition is, becomes hydrochloric acid First introduced separately into the water before the molten, softening Components are added.

The Emulsion is at 30 ° C with stirring Cool at 300 to 400 rpm calmly. If appropriate, the particle size distribution of the emulsion will continue reduced by subjecting the product to high pressure homogenization becomes. This step reduces the viscosity of the composition. Calcium chloride, Preservatives, sequestering agents and other optional ingredients As the thickeners are all stirred one after the other in the cooled Product introduced.

EXAMPLE 1

manufacturing a perfume containing microemulsion

The Compositions 1 to 6 were made according to the procedures described above each composition being varying weight percentages of four main components: cationic surfactant, organic Solvent, Perfume and water. The relationship of perfume to organic solvent was held constant at 60:40. The compositions are in Table 1 together with the observations on the appearance the resulting composition is indicated, wherein whether it belongs to the invention, namely a water-in-oil microemulsion forms, or outside the Invention is formed by forming an emulsion.

TABLE 1

As in Table 1, the compositions are 1 to 4 W / O microemulsions from the scope of the invention; the compositions are 5 and 6 Emulsions.

EXAMPLE 2

PREPARATION OF W / O MICROEMULSION, THE PERFUME AND COLORING AGENT CONTAINS

It Compositions 7 to 9 were prepared containing a fixed amount Perfume and a varying amount of colorant contained. The compositions are shown in Table 2 below along with physical appearance obser vations the resulting composition indicated.

TABLE 2

EXAMPLE 3

THE EFFECT OF INCREASING THE QUANTITY OF SOLVENT ON THE MICROEMULSION AREA OF THE PHASE DIAGRAM

Around the effect of increased Amounts of organic solvent to demonstrate the field of microemulsion compositions Compositions 5, 6, 10, 11 and 12 were made in which the weight ratio from perfume to organic solvent was varied. The compositions are summarized in Table 3 with the observations regarding the appearance of the resulting Composition indicated.

TABLE 3

The Compositions 5 and 6 are two compositions of Example 1, the outside but the invention are in Table 3 as comparison compositions are included. Table 3 shows that it is through change of the relationship of perfume to organic solvent possible is, a cloudy To convert emulsion into a clear perfume microemulsion, which for the present Invention is suitable. A comparison of Composition 11, a clear W / O microemulsion, with the emulsion compositions 5 and 10, the outside The invention therefore emphasizes the importance of the ratio from perfume to organic solvent. A comparison of the compositions 6 and 12 shows accordingly, that by suitably adjusting the ratio of perfume to organic solvent a composition that is outside the invention is (composition 6), can be reformulated, to provide a clear W / O microemulsion (Composition 12).

EXAMPLE 4

PREPARATION OF W / O MICROEMULSIONS WITH DIFFERENT CLASSES OF SOLVENTS

The Compositions 13-18 were prepared to improve the ability for the preparation of microemulsions according to the present invention using organic solvents from the following To show classes: ethers, esters, glycols and alkanols. The compositions are in the following Table 4 together with the observations regarding the appearance of the resulting composition.

TABLE 4

EXAMPLE 5

DISPERSION OF PERFUMES INCLUDING MICROEMULSION INTO A SOFTENING BASIS

The Dispersion properties of a perfume-containing microemulsion according to the present This invention has been demonstrated by using two different base softening compositions were used and compared with a dispersion in 100% water were. The perfume microemulsion composition included the following: 39% perfume, 26% EGMBE organic solvent, 25% DODEQ, 0.48% Liquitint Royal Blue stain (4% solution) and as rest water.

A first softening base composition ("AA / EstQ" basis) included the following: 2.74% Amidoamine (Rewopal V3340), 1.64% Esterquat (Tetranyl AT1-75), 0.29% glyceryl monooleate, 0.3% hydrochloric acid (25% Solution), 0.074% lactic acid (Purac SP80) and the rest of the water.

The second softening base composition ( "EstQ / FA" base) included the following: 3.9% Esterquat (Tetranyl AT1-75), 0.83% C _16-18 fatty alcohol, 0.2% alcohol ethoxylate (C _13-15 Fatty alcohol 20EO), 0.1% aminotrimethylphosphonic acid, 0.063% lactic acid / lactate buffer solution, 0.20% polyacrylate thickener and balance water.

The Perfume microemulsion was incorporated into each of the above-described softening base compositions in an amount of 1.28 wt .-% under very low shear conditions introduced. Mixing was achieved with an Oscell 12 shaker, 12 seconds was operated at 700 oscillations per minute for a long time. The particle size of the plasticizing Base compositions were before and after the addition of the perfume microemulsion measured. For comparative purposes, the dispersion was measured "as is" by pure perfume later was added to each softening base.

TABLE 5 Particle size of the softening base before and after the subsequent addition of perfume

As shown by the data was the dispersion of the perfume in the softening base efficiently using the microemulsion of the invention carried out has been. The addition of pure perfume ("as is") under the same mixing conditions led to an unacceptable dispersion of perfume in the softening base.

EXAMPLE 6

Of the Purpose of this example was the uselessness of a perfume containing Water-in-oil microemulsion to show that is not formulated according to the invention.

• (a) 35,8 Gew.-% Natriumlaurylethersulfattensid,
• (b) 15,4% Wasser,
• (c) 24,4% Parfüm,
• (d) 24,4% DPM organisches Lösungsmittel.

The microemulsion composition included the following:

• (a) 35.8% by weight of sodium lauryl ether sulfate surfactant,
• (b) 15.4% water,
• (c) 24.4% perfume,
• (d) 24.4% DPM organic solvent.

• (a) 9,2 Gew.-% Amidoamin (Rewopal V3340),
• (b) 4,5% Esterquat (Tetranyl AT1-75),
• (c) 1,0% Glycerinmonooleat,
• (d) 1,4% HCl (25%ige Lösung)
• (e) 0,15% Calciumchlorid (20%ige Lösung),
• (f) 0,25% Milchsäure/Lactat-Pufferlösung,
• (g) 0,4% Liquitint Royal Blue (4%ige Lösung).

The softening base composition included the following:

• (a) 9.2% by weight of amidoamine (Rewopal V3340),
• (b) 4.5% esterquat (tetranyl AT1-75),
• (c) 1.0% glycerol monooleate,
• (d) 1.4% HCl (25% solution)
• (e) 0.15% calcium chloride (20% solution),
• (f) 0.25% lactic acid / lactate buffer solution,
• (g) 0.4% Liquitint Royal Blue (4% solution).

5 % By weight of the perfume W / O microemulsion composition containing the softening Base composition added under gentle mixing conditions. It It was observed that a precipitate formed, which is a phase separation and product instability shows.

Claims (15)

Perfume-containing water-in-oil microemulsion capable of being mixed with a perfume-free fabric softening base composition which is in the form of an aqueous emulsion so as to provide perfume in the aqueous emulsion under low shear conditions while avoiding any gelling problem thereby to provide a physically stable perfume-containing liquid fabric softening composition, the water-in-oil microemulsion comprising: (a) from 5 to 80% by weight of surfactant fabric softening agents selected from the group consisting of: (i) diester ammonium compounds the following structural formulas:

wherein each A is independently C (O) OR 'or -O (O) CR', R is a lower alkyl group of 1 to 4 carbon atoms, R 'is an alkyl or alkenyl group of 8 to 22 carbon atoms, R''is independently a lower alkyl radical having 1 to 6 carbon atoms or a hydroxyalkyl group or H, n is a number having a value of 2, and X ^- is a softener compatible anion, and

in which B is independently A or (R) A and A, R, R "are as defined above, and

in which A, R and R "are as defined above, and / or (ii) diamidoammonium compounds having the formula

and R 'is as defined above, R ¹ is a lower alkyl radical having 1 to 4 carbon atoms or hydrogen and R is an alkylene radical having 2 to 4 carbon atoms, (b) 2 to 50 wt .-% organic solvent, ^(- X c) from 5 to 80% by weight of water immiscible perfume, wherein components (a), (b) and (c) comprise the oil phase of the microemulsion, (d) 0 to 1% of colorant and (e) 0.5 to 25% by weight of water, the microemulsion being free of anionic surfactant and having a weight ratio of the oil phase to water of from 3: 1 to 200: 1, the percentages of components (a), (b) and (c) and the weight ratio value is chosen such that the resulting composition forms a water-in-oil microemulsion. A microemulsion according to claim 1, wherein the quaternary ammonium diester surfactant Methylbis [ethyl (oleyl)} - 2-hydroxyethylammonium methylsulfate. A microemulsion according to claim 1, wherein the organic solvent is an aliphatic alcohol having 1 to 6 carbon atoms. A microemulsion according to claim 3, wherein the organic solvent n-butanol is. A microemulsion according to claim 1, wherein the organic solvent is a polyhydric aliphatic alcohol. A microemulsion according to claim 5, wherein the polyvalent Alcohol is hexylene glycol. A microemulsion according to claim 1, wherein the organic solvent is an aliphatic ether. A microemulsion according to claim 7, wherein the ether Dipropylene glycol methyl ether. A microemulsion according to claim 7, wherein the ether Dipropylene glycol n-butyl ether. A microemulsion according to claim 7, wherein the ether Ethylene glycol is monobutyl ether. A microemulsion according to claim 1, wherein the organic solvent is an aliphatic ester. A microemulsion according to claim 11, wherein the ester Methyl lactate is. A microemulsion according to claim 1, wherein the fabric softening base composition a quaternary Contains ammonium diester plasticizer. Process for introducing a perfume into a fragrance free A fabric softening base composition which is in the form of an aqueous Emulsion is present under low shear conditions and without adverse effect their physical stability, in which (a) a perfume-containing Water-in-oil microemulsion according to claim 1 is provided, and (b) an amount of the water-in-oil microemulsion, which is sufficient to the desired Lot of perfume to be incorporated with the fabric softening base composition Conditions with low shear mixing, causing the conversion the microemulsion and the dispersion of the perfume in the aqueous emulsion to form a physically stable perfume-containing liquid fabric softening composition is effected. Process for imparting softness to textiles accompanied by a perfume fragrance, in which the textiles with a softening acting amount of liquid fabric softening composition formed according to claim 14 is, is brought into contact.